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How to clean up server disk space (without breaking any sites)? And figure out which apps are using how much RAM (via the terminal)

I am using RunCloud on top of a DigitalOcean droplet, and my web apps (in total) use only 2.2GB. I want to downgrade my droplet, but I need to clear as much disk space as possible (as well as check ...
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1 answer
23 views

Deprecation of OrganizationalUnit in Subject of TLS Certificates

Recently we got a mail from our certificate provider that they are removing the OU field from Subject of new/renewed certificates after 1st September. This is related to decision made by Certificate ...
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22 views

Nginx: aim at two applications

I need the Nginx service to be set that if I call the main directory it must call an app, if I call a subdirectory it must call other app, for example: www.website.com -> localhost:8080 www.website....
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11 views

Performance improvement for Innodb - High CPU

I have a dotnet application that has a high-traffic connection to the MySQL database. It's an application that stores IoT data. It connects to the database approximately 50 times per second. In these ...
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21 views

OVH IPv6 on ESXi -> pfSense -> VM setup

Currently setting up some VMs on an ESXi host on an OVH machine. I have two IPv4s on OVH including a virtual MAC address as needed by OVH. One IPv4 for the ESXi host itself, another one for the ...
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1 vote
0 answers
46 views

Hyper-V 2019 Core Server can't install windows defender update KB4052623?

I am having a problem with installing the "Update for Microsoft Defender Antivirus antimalware platform - KB4052623 (Version 4.18.2205.7)" Update on my Microsoft Hyper-V Server 2019 Core ...
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  • 11
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1 answer
19 views

Debian 11 - Low entropy (256) even with Haveged and rng-tools on old laptop

I have a problem with an old laptop. I have installed a debian 11 operating system on it a year ago, and despite using it almost daily to perform network administration, I recently found its available ...
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10 views

How to disable `tcp_slow_start_after_idle` only for selected interface or route?

I'm running a server with multiple network interfaces (some are VLAN interfaces). Some of the connections are in local network with highly bursty traffic over TCP meaning they suffer at lot from ...
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Kubernetes Network Namespace descriptio

I am new to detailed networking. I am trying to understand the details on how kubernetes networking works. Network Namespace cni-0ed19206-6689-517c-cad4-e85b587fcc10 When I run following command ip ...
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24 views

Port forwarding from external network to localhost

I have a service listen on 127.0.0.1:8080, and I only want to export port 80 to outside. I tried port forwarding but no success. So how can I forward port 80 to localhost:8080? This is what i tried: ...
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File Creation/Deletion over SMB sometimes happening in 25 microseconds

Scenario: I am Creating and Deleting a File in my program using the following OS calls: In Windows: CreateFileW ((LPCWSTR) filename, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | ...
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Cloud platforms CDN: is it possible to make specific API request going through CDN caching?

I have encountered many Apps that has a server-side handler with the following features: (1) The App makes "pictures, musics" that needs to be downloaded going through a CDN caching network ...
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Repair a Hyper-V cluster

Due to the error Cluster network name resource 'Cluster Name' failed registration of one or more associated DNS name(s) for the following reason: DNS bad key. I have planned to perform a repair of ...
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0 answers
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Can't mount a NFS share on File server rule running in Windows Failover Cluster

On Microsoft Windows Failover Cluster (Windows Server 2019 Datacenter) I've created a File Server role and created a NFS share (similar to how it's described in these instructions). The idea was to ...
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  • 221
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0 answers
25 views

vmdk image without /dev/root

I have vmdk server image without /dev/root, I want to deploy it with DigitalOcean (they support custom images). I created images, started droplet, but unable to connect via ssh. I entered ...
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  • 101
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0 answers
5 views

Enalble Writable FTP or Samba on a ZTE Router(Shipped as Airtel Nokia Router)

I have enabled ftp as well as Samba service for the usb device connected to my router. However, both are readonly. I see that tplink routers can be configured to use ftp in writeable mode as well - ...
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0 answers
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What is the timeout duration of file read/write OS calls on network based on?

Scenario: I have shared a file over SMB, on a linux server, and accessing it using another linux client. Linux Client opens the file using open OS call. Linux Server is disconnected from the network. ...
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27 views

Ubuntu 18.04 Server uses only 2GB RAM even under high load

my Ubuntu 18.04 Server has 64GB RAM but when I check via htop it never uses more than 2 GB RAM. This also happens if I install Web Apps or if I create database dumps. I would expect my server to use ...
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  • 1
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0 answers
5 views

Nginx: Relationship between number of client connections and Nginx performance

I am benchmarking an open-sourced application(Social networking application) using wrk2 as the workload generator. If I keep the load constant (requests per second) but increase the number of ...
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  • 101
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0 answers
13 views

Hwo to trim email addresses in Exim?

I have a list of emails from client accounts that are built like this: name+somegiberish@gmail.com I have tied looking into configs but haven't found such an option. How do i trim in Exim those emails?...
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1 vote
0 answers
14 views

Why lock on a file shared over SMB taking only 3 microseconds?

I used the following C++ functions to lock 1 byte of a file that is shared by server via SMB: On Windows: LockFileEx (h, LOCKFILE_FAIL_IMMEDIATELY | LOCKFILE_EXCLUSIVE_LOCK, 0, 1,0, &overlapped) ...
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1 answer
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What's it called? Feature in remote desktop software? Client is told to put a code in a website which starts a remote desktop session?

I saw it once while I was fixing this one guys computer. We went to a website and put some numbers in a box. These numbers then prompted an executable which we downloaded and ran, which then started a ...
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0 answers
15 views

AWS limited account: 3 days at time of writing and nothing changed

I have a AWS account. Because they thought it was compromised (I did access from a new location as root) they wrote me and denied some functions (e.g. lambda). Now, I'm writing them from 28/06/2022 (4 ...
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  • 111
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0 answers
9 views

Use AWS SAM to Create AWS Lambda Layer for Python (Serverless Application Model)

I'm trying to use AWS SAM / Serverless application Model to deploy a combination of Python and native libraries to Lambda as a layer, for use from a Python Lambda function. I'd appreciate some help ...
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0 votes
1 answer
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podman: why need host network mode

As per man podman-run container's network can be configured in the host mode: --network=mode, --net ... host: Do not create a network namespace, the container will use the host’s network. Note: The ...
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  • 209
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0 answers
11 views

dnsmasq, one host on multiple vlans

I have dnsmasq configured to serve static dhcp on two networks; one on the primary interface and one on a vlan attached to the primary interface. The interface config looks like this: 3: enp2s0: <...
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  • 40.4k
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0 answers
22 views

What's the best practice for internal-only DNS server?

Suppose a company has both public web server (say, www.example.com) and DNS authoritative server hosted by cloud service provider (say, AWS). Inside HQ, the local area network is divided into subnets ...
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0 answers
8 views

CORS with Auth module in Apache2

I am triying to set up a data server that restrict the access to the public but allows access from a host or domain, but at the same time I need to enable CORS, this is what I tried in my virtualhost ...
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0 votes
0 answers
10 views

Proxmox Internal Network

I am in need of a internal network on my Proxmox 7.2 installation. I want to use a reverse proxy server to connect all of my VMs to the internet. That way I only have the need for one WAN address. I'm ...
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  • 1
0 votes
1 answer
6 views

Tableau hyper_0 process fails with result code 7

Our Tableau on a linux docker image entered a degraded state. When I ran tsm status -v I got the following: node1: localhost Status: DEGRADED 'Tableau Server Gateway 0' is running. ...
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  • 131
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0 answers
29 views

Setting up multiple instances on a single server

I've made a business management software. It runs on Django - Gunicorn - PostgreSQL - Debian - Nginx - Amazon Lightsail. I want to move it to a server I am setting up in my basement on Dell R620. I ...
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  • 115
0 votes
1 answer
28 views

Azure new Virtual Machine Windows Server 2022 can't make IIS work for a simple website

I got a new Azure Virtual machine server 2022 datacenter edition, they don't have the option "endpoints" where you configure the port 80 for http, I tried option "networking" 'add ...
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0 answers
22 views

In a domain network after a while "unidentified network", where to dig?

A domain is deployed on the server (AD, DNS, DHCP, routing and network): two network cards (one looks to the Internet, ip like 10.x.x.x, the other to LAN - ip 192.168.1.5) turned DNS (forward and ...
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0 votes
1 answer
35 views

Running out of TCP ports in linux(Red hat) while doing load test

I'm doing load test for 30000TPS(transaction per second) using gatling, I facing the following error i.n.c.u.Errors$NativeIoException: newSocketStream(..) failed: 99128 (99.43%) Too many open ...
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  • 101
0 votes
1 answer
27 views

How to resize Partitions on Proxmox?

Hey im Hosting Proxmox on a Small Hosting Provider and after i added more Space to my "sda" Proxmox refused to start and i wasnt able to go on the WebInterface. I still was able to go into ...
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0 answers
10 views

How to enable SSL Proxy only on certain Locations in Apache

I am trying to use Apache as reverse proxy. For some locations I want to convert the client's HTTPS request to HTTP requests on the server. For another location I want to keep the client's HTTPS ...
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-1 votes
1 answer
22 views

Encrypted Disk (LUKS): Upgrading from RHEL 8 to RHEL 9

Known limitations - Notable known limitations of Leapp currently include: Encryption of the whole disk or a partition, or file-system encryption currently cannot be used on a system targeted for an ...
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0 votes
1 answer
31 views

DNS strange behavior for VPN addresses

I'm having this strange behavior when I connect to my company VPN using barracudavpn (my OS is Fedora 36). After connecting network configuration seems ok: $ route -n Kernel IP routing table ...
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  • 131
0 votes
0 answers
15 views

Kubernetes Pods Getting in Pending State Forever

We have a CronJob which will run every 'x' minutes. For each and every Schedule, A Pod will be Scheduled and it runs and it is doing its job. Now, After 2-3 days, The Pod is getting into Pending State ...
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0 answers
21 views

Virtual Switch of Hyper-V remove outer tag of QinQ packet using both 0x8100 EtherType

I have vyos virtual machine using one network adapter in Hyper-V server. I configure the only network adapter to trunk mode: C:\> Get-VMNetworkAdaptervlan -VMName $VM | fl VMName : ...
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0 votes
0 answers
26 views

How to block the executable file upload in web server [migrated]

I am working on a web app project to block all the file executable from file upload. Example: user can upload, txt, png, image and video files and not any executable scripts like, Perl, Python, exe, ...
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  • 205
0 votes
0 answers
14 views

Apache shows 404 but on localhost Spring app works

I've installed Tomcat 9, Apache httpd 2.4.6, and Let's Encrypt for SSL, on Centos 7 on the Google Cloud instance. It's the second time I'm doing this configuration so I was using the similar ...
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0 votes
0 answers
14 views

Proftpd "Can't open PID file /run/proftpd/proftpd.pid (Yet?)"

I'm currently running into the following error with my Proftpd install: Can't open PID file /run/proftpd/proftpd.pid (yet?) after start: No such file or directory However when I run ls /run/proftpd/ ...
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0 votes
1 answer
12 views

Hide Task Scheduler Error message

I have a scheduled task that runs a bat file silently on the local computer. When the file is in place everything works fine, but if it is missing task scheduler will throw up an error that bothers ...
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  • 11
0 votes
1 answer
17 views

domain "alias" in LAN

I have the following setup: a registered domain, domain1.com, with several websites/webapps under different subdomains: sub1.domain1.com, sub2.domain1.com etc. on my LAN I have a pfsense router and a ...
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0 votes
0 answers
7 views

Apache2 htaccess issues when using vhost_alias

I have the vhost_alias module set up and loaded, and have the following in a host file inside sites-enabled UseCanonicalName Off <VirtualHost *:80> ServerName vhosts.local ...
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0 votes
0 answers
19 views

docker swarm nfs volume not showing all directories

I've hit a wall with trying to figure this out. I'm running docker swarm on two nodes and I created an nfs volume to my synology. Inside of the container: root@container:/data# ls -ltr drwxr-xr-x 4 ...
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  • 193
0 votes
1 answer
27 views

How to prevent changing ownership of '/data/db' in mongodb pod

I'm running a mongodb instance as a kubernetes pod in a single node cluster (bare metal ubuntu machine). The volume is configured ReadWriteOnce as the mongodb pod is accessed only by pods in one node. ...
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0 votes
0 answers
14 views

pam radius bypass same local user (exception user)

Pam Radius login works with the following configuration. However, it would be necessary for some users to perform local authentication. How can I solve this? [xxxxxxxxxxx ~]# cat /etc/pam.d/sshd #%PAM-...
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  • 1
0 votes
1 answer
49 views

mdadm raid1 irregular degraded without reason

My raid1 went to degrade state from time to time. Then my application crashes, because the raid is in read-only mode. After a reboot the raid is working fine again. Now I want to find out whats the ...
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  • 3

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